Swine flu vaccine

Tim Sloan / AFP/Getty Images

A child is restrained as he receives the H1N1 vaccine in nasal spray form in October at a clinic in Silver Spring, Md. The doses affected by the recall are pre-filled syringes made for children ages 6 months to 35 months.

A child is restrained as he receives the H1N1 vaccine in nasal spray form in October at a clinic in Silver Spring, Md. The doses affected by the recall are pre-filled syringes made for children ages 6 months to 35 months. (Tim Sloan / AFP/Getty Images)

A child is restrained as he receives the H1N1 vaccine in nasal spray form in October at a clinic in Silver Spring, Md. The doses affected by the recall are pre-filled syringes made for children ages 6 months to 35 months.